Summary
Expedition 401 Mediterranean-Atlantic Gateway Exchange began in Amsterdam, Netherlands on December 12th and ended in Naples, Italy on February 9th. We drilled a total of 4 sites for the extent of the expedition recovering sediment. The samples processed in the x-ray lab where as follows:
- XRD samples were taken to be analyzed as bulk samples.
- XRD samples were taken to be analyzed as clay samples, which were then run as three separate analysis:
- Clay samples, no treatment involved
- Clay samples, glycolated for 12 hours
Sample Totals
Site | XRD |
|---|---|
| U1611 | |
| U1610 | 128 |
| U1609 | 104 |
| U1385 | 40 |
| Total |
Clay separation procedure for XRD in expedition 401
- Add sample in 50 ml centrifuge tube
- Add 45ml of water, I added DI water but it can be regular water as well (as mentioned by scientist)
- Sonify samples until the sample are all desegregated
- If samples, flocculate, then add sodium hexametaphosphate about a small tablespoon
- Leave for 4 hours, calculate time by measuring height of sample (Stoke's law)
- Empty suspended liquid in another centrifuge tube
- Then centrifuge 3000 rpm for 60 min
- Mount clay and measure, then glycolate for 12 hrs. and measure
Bruker D4 Endeavor
All of the XRD samples this expedition where run on the Bruker D4 including clays and glycolated samples.
...
- Bulk (~2hr scan)
- random mount
- 4°-70°
- Step: 0.02°
- Scanning speed: 2s/step
- Clay (~1hr scan)
- oriented mount
- 4°-40°
- Step: 0.02°
- Scanning speed: 2s/step
Issues
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